subquery
Hibernate Subselect vs Batch Fetching
Hibernate provides (at least) two options for getting around the N+1 query problem. The one is setting the FetchMode to Subselect, which generates a select with a IN-clause and a subselect within this[详细]
2023-03-31 20:44 分类:问答Synchronize a Select Projection
I would like to use a table alias within the projection of another select statement, like this: SELECT [ID][详细]
2023-03-31 15:17 分类:问答Need help with a tough SQL query
I have a query that I am currently getting the ORA-01427: single-row subquery returns more than one row error on.I understand the error, and what is causing it, but cant figure out a way to fix it.I w[详细]
2023-03-30 19:38 分类:问答MySQL correlated subquery SUM() ORDER BY
Is there anyway to optimize the following query: SELECT t1.id, (SELECT SUM(col1) FROM table_name_two t2 WHERE t2.name LIKE CONCAT(\'%\',t1.name)) AS col1_count[详细]
2023-03-30 17:19 分类:问答nhibernate queryover join with subquery to get aggregate column
I have been searching for several hours now how to do this, but can\'t seem to find anything to help me.[详细]
2023-03-30 12:49 分类:问答How to do a subquery against multiple phrases with LIKE or REGEXP?
I am trying to use a where clause with like on a column.However I need it to use a subquery to search against multiple phrases.[详细]
2023-03-30 02:12 分类:问答Help with performance: SUBQUERY vs JOIN
this is my problem: SUBQUERY 2.7 secs SELECT SQL_NO_CACHE item_id FROM mtrt_items_searches WHERE search_id IN ([详细]
2023-03-29 09:23 分类:问答Using a subquery for a column with QueryOver
I\'m trying to get something similar to the SQL below via QueryOver: SELECT docs.*, (SELECT TOP 1 eventDate from events WHERE id=do开发者_如何学Gocs.id[详细]
2023-03-29 06:48 分类:问答mysql concat sub query results as a subquery itself
this is a bit tough, i guess. what i\'m trying to achieve is to generate a string via group_concat and then run it as a query. my query return the[详细]
2023-03-28 20:44 分类:问答Getting confused by MySQL subqueries
I\'m trying to learn how to do subqueries, and I\'m really confused at what\'s wrong with this simple example.[详细]
2023-03-28 14:39 分类:问答